16 years ago Yoongi and Jimin had a baby. Also 16 years ago Namjoon and Jin had a baby two days later. 16 years later, those two children fell in love with one another, they grew up together and know everything there is to know. Yoongi and Jimin's baby is a vampire. Namjoon and Jin's baby is human. But, when the vampire council hear's of the romance, they send one of their best agents. Kim Youni. The true brother of Kim Sunbae. He has been waiting to take his revenge on the people who killed his beloved sister. Now, it's up to Yoonmin and Namjin to stop him from killing their family. Secrets will be revealed and people who were thought dead, are not. Will Yoonmin and Namjin save their family? Find out in "Other Side" the last book in the KoBK series.